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Safely pulling double and triple trailers requires knowledge and skill. If you want to pull double or triple trailers, you must add the Doubles/Triples (T) endorsement to your Class A CDL. The Indiana doubles triples test consists of 20 questions. To pass, you must correctly answer at least 16 questions (80%). The IN CDL doubles triples test covers the following sections of the Indiana CDL Manual: Driving Safely, Air Brakes (if you plan to operate vehicles equipped with air brakes), Combination Vehicles, Doubles and Triples. Take this IN CDL practice test now to prepare for the actual test! Important: Triple trailers are not legal in Indiana.
1. When you make a quick lane change, the crack-the-whip effect can turn the trailer over. The crack-the-whip effect is caused by:
strong wind.
the rear trailer of a triple.
rearward amplification.
worn tire tread.
2. During a walk around inspection of a combination vehicle, drivers should check that:
all locking pins are present and locked in place.
the glide plate is securely mounted to the trailer frame.
the locking jaws are around the shank.
All of the above.
3. You should do an after-trip inspection:
after each trip.
at least once a week.
after each stop.
once a month.
4. If there is a fire in your vehicle, do NOT:
park away from buildings and other vehicles.
pull into a service station.
park in an open area.
notify emergency services.
5. Many large vehicles have convex (curved, "spot, "fisheye") mirrors. Convex mirrors:
misrepresent reality by showing a larger area than flat mirrors.
are illegal in most states.
make things look smaller and farther away than they really are.
None of the above.
6. Radial and bias-ply tires:
should be used together only during bad weather.
should be used together.
should be used together only when driving in packed snow.
should not be used together.
7. Doubles:
require more reaction time than straight trucks.
are less likely to rollover than straight trucks.
are easier to drive than straight trucks.
None of the above.
8. If driving a heavy vehicle, you should:
try to pass other vehicles going uphill.
stay in the right lane.
stay in the left lane.
avoid braking.
9. How should you brake if your vehicle loses ABS?
Stay off the Brake
Pump the brake repeatedly
Brake as you always have.
Step on and off the brake pedal several times
10. When driving in very hot weather, you may have to:
decrease your following distance.
increase your speed until the tires cool off.
reduce your speed to prevent overheating.
watch out for black ice.
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Doubles Triples IN CDL Test

Number of questions: 20
Correct answers to pass:16
Passing score:80%
Number of questions: 20
Correct answers to pass:16
Passing score:80%
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